React Interview Questions
React components, hooks, state, props, virtual DOM, routing and performance.
74 questions
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1. What is React and Why Use It?
easyFundamentals 5 mins2. What is JSX in React?
easyFundamentals 5 mins3. What are Components in React?
easyComponents 5 mins4. Functional vs Class Components in React
easyComponents 6 mins5. What are Props in React?
easyComponents 6 mins6. What is State in React?
easyState 6 mins7. Difference Between State and Props in React
easyState 5 mins8. What is the useState Hook in React?
easyHooks 5 mins9. What is the useEffect Hook in React?
mediumHooks 6 mins10. What is the Virtual DOM in React?
mediumRendering 6 mins11. What is Reconciliation in React?
mediumRendering 6 mins12. What are Keys in React Lists?
easyRendering 5 mins13. Controlled vs Uncontrolled Components in React
mediumForms 6 mins14. What is the Context API in React?
mediumHooks 6 mins15. What is the useRef Hook in React?
mediumHooks 6 mins16. What is the useMemo Hook in React?
mediumHooks 6 mins17. What is the useCallback Hook in React?
mediumHooks 6 mins18. useMemo vs useCallback in React
mediumHooks 6 mins19. What are Custom Hooks in React?
mediumHooks 6 mins20. What are the Rules of Hooks in React?
mediumHooks 6 mins21. What is Prop Drilling and How to Avoid It?
mediumState 6 mins22. What is React.memo?
mediumPerformance 6 mins23. What is the useReducer Hook in React?
mediumHooks 6 mins24. What is Lifting State Up in React?
easyState 5 mins25. What is React Router?
mediumRouting 6 mins26. What are React.lazy and Suspense?
mediumPerformance 6 mins27. What are Error Boundaries in React?
mediumAdvanced 6 mins28. What is the useLayoutEffect Hook in React?
hardHooks 6 mins29. What are Higher-Order Components (HOC) in React?
mediumAdvanced 6 mins30. What is the useEffect Cleanup Function in React?
mediumHooks 6 mins31. What is the useEffect Dependency Array?
mediumHooks 6 mins32. What are React Fragments?
easyComponents 5 mins33. How Does Conditional Rendering Work in React?
easyRendering 5 mins34. How Do You Render Lists in React?
easyRendering 5 mins35. How Does Event Handling Work in React?
easyEvents 5 mins36. What is the children Prop in React?
easyComponents 5 mins37. What are Class Component Lifecycle Methods?
mediumLifecycle 7 mins38. What are React Portals?
mediumAdvanced 7 mins39. What is forwardRef in React?
mediumHooks 6 mins40. What is the useImperativeHandle Hook?
hardHooks 7 mins41. What is the useId Hook in React?
mediumHooks 6 mins42. What is the useTransition Hook in React?
hardConcurrent 7 mins43. What is the useDeferredValue Hook?
hardConcurrent 8 mins44. What is React StrictMode?
mediumAdvanced 7 mins45. What are Synthetic Events in React?
mediumEvents 7 mins46. Client-Side vs Server-Side Rendering in React
mediumRendering 6 mins47. What is Hydration in React?
hardRendering 7 mins48. What are React Server Components?
hardAdvanced 8 mins49. What is Code Splitting in React?
mediumPerformance 6 mins50. What is State Batching in React?
mediumState 6 mins51. What is Redux and When to Use It?
mediumState Management 7 mins52. Redux vs Context API in React
mediumState Management 7 mins53. Why is Immutability Important in React State?
mediumState 7 mins54. What is the useSyncExternalStore Hook?
hardHooks 8 mins55. How Do Controlled Forms Work in React?
mediumForms 6 mins56. Why Should You Not Use Index as a Key in React?
mediumRendering 6 mins57. What is the Render Props Pattern in React?
mediumPatterns 7 mins58. What is the Compound Components Pattern?
hardPatterns 8 mins59. How Do You Avoid Unnecessary Re-Renders in React?
mediumPerformance 7 mins60. How to Combine useContext with useReducer?
hardState Management 9 mins61. What are Components in React?
easyFundamentals 5 mins62. What is the Difference Between Props and State?
easyFundamentals 5 mins63. What are Hooks in React?
easyHooks 5 mins64. What is useEffect in React?
easyHooks 6 mins65. What is useState in React?
easyHooks 5 mins66. What is a Key in React Lists?
easyFundamentals 5 mins67. What is useContext in React?
mediumHooks 6 mins68. What is useMemo in React?
mediumPerformance 6 mins69. What is useCallback in React?
mediumPerformance 6 mins70. What is useRef in React?
mediumHooks 6 mins71. What Is Reconciliation in React?
hardRendering 7 mins72. What Is Lazy Loading in React?
hardPerformance 6 mins73. Class vs Functional Components in React: What's the Difference?
hardComponents 7 mins74. What Is a Fragment in React?
hardJSX 5 mins